Using Spring IOC with ZK

package au.com.zkproject.controller;

import java.util.ArrayList;
import java.util.Arrays;

import org.apache.commons.lang.StringUtils;
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.util.GenericForwardComposer;
import org.zkoss.zkplus.spring.SpringUtil;
import org.zkoss.zul.Button;
import org.zkoss.zul.Combobox;
import org.zkoss.zul.Radiogroup;

import au.com.zkproject.service.ConnectionService;
import au.com.zkproject.service.ModelService;

public class EventController extends GenericForwardComposer {
  
 
  private Combobox cbServer; // database server
  private Radiogroup rgDbType;
  
  private transient ConnectionService connectionService;
  private transient ModelService modelService;
  
  public ConnectionService getConnectionService() {
    if (connectionService == null) {
      connectionService = (ConnectionService)SpringUtil.getBean("connectionService");
      setConnectionService(connectionService);
    }
    return connectionService;
  }
  
  public void setConnectionService(ConnectionService connectionService) {
    this.connectionService = connectionService;
  }
  
  public ModelService getModelService() {
    if (modelService == null) {
      modelService = (ModelService)SpringUtil.getBean("modelService");
      setModelService(modelService);
    }
    return modelService;
  }
  
  public void setModelService(ModelService modelService) {
    this.modelService = modelService;
  }
  
  public void onFocus$cbServer(Event evt) {
    final String dbType = rgDbType.getSelectedItem().getLabel();
    if (!StringUtils.isEmpty(dbType)) {
      ListModel model = getModelService().getServerListModel(dbType);
      cbServer.setModel(model);
    }
  }
}

<?page id="mainPage" title="Database tool alpha"?>
<zk>
<window id="connectWindow" title="Welcome to Database Tool Alpha!!"
border="normal" width="100%" apply="au.com.zkproject.controller.EventController">
<hbox pack="end">
<label value="Please enter parameters to connect to a database"/>
<vbox width="360px">
<hbox>
<label value="Choose a driver:"/>
<radiogroup id="rgDbType">
      <radio id="rdMSSQL" label="Microsoft SQL Server" checked="true"/>
      <radio id="rdOracle" label="Oracle" />
</radiogroup>
</hbox>
<hbox>
<label value="Database Server:" />
<combobox id="cbServer" cols="20" buttonVisible="false" autodrop="true"/>
</hbox>
</vbox>
</hbox>
</window>
</zk>

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>DatabaseTool</display-name>
  <listener>
  	<description>
  	Used to cleanup when a session is destroyed</description>
  	<display-name>ZK Session cleaner</display-name>
  	<listener-class>org.zkoss.zk.ui.http.HttpSessionListener</listener-class>
  </listener>
  <!-- INI SPRING -->
  <!--
    - Location of the XML file that defines the root application context.
    - Applied by ContextLoaderServlet.
  -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring-*.xml</param-value>
  </context-param>

  <!--
    - Loads the root application context of this web app at startup,
    - by default from "/WEB-INF/applicationContext.xml".
    - Note that you need to fall back to Spring's ContextLoaderServlet for
    - J2EE servers that do not follow the Servlet 2.4 initialization order.
    -
    - Use WebApplicationContextUtils.getWebApplicationContext(servletContext)
    - to access it anywhere in the web application, outside of the framework.
    -
    - The root context is the parent of all servlet-specific contexts.
    - This means that its beans are automatically available in these child contexts,
    - both for getBean(name) calls and (external) bean references.
  -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  
  <listener>
        <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
  </listener>
    <!-- END SPRING -->
  <servlet>
  	<description>
  	The ZK loader for ZUML pages</description>
  	<servlet-name>zkLoader</servlet-name>
  	<servlet-class>org.zkoss.zk.ui.http.DHtmlLayoutServlet</servlet-class>
  	<init-param>
  		<param-name>update-uri</param-name>
  		<param-value>/zkau</param-value>
  	</init-param>
  	<load-on-startup>2</load-on-startup>
  </servlet>
  <servlet>
  	<description>
  	The asynchronous update engine for ZK</description>
  	<servlet-name>auEngine</servlet-name>
  	<servlet-class>org.zkoss.zk.au.http.DHtmlUpdateServlet</servlet-class>
  </servlet>
  <servlet-mapping>
  	<servlet-name>zkLoader</servlet-name>
  	<url-pattern>*.zul</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
  	<servlet-name>zkLoader</servlet-name>
  	<url-pattern>*.zhtml</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
  	<servlet-name>auEngine</servlet-name>
  	<url-pattern>/zkau/*</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
    <welcome-file>index.zul</welcome-file>
  </welcome-file-list>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns:context="http://www.springframework.org/schema/context"
     xmlns:aop="http://www.springframework.org/schema/aop"
     xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context-3.0.xsd
         http://www.springframework.org/schema/aop
         http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
  <!-- services -->
  <bean id="connectionService" scope="session" class="au.com.zkproject.impl.ConnectionServiceImpl" >
  </bean>
  
  <bean id="modelService" scope="session" class="au.com.zkproject.impl.ModelServiceImpl">
  </bean> 

  <!-- controllers -->
</beans>